Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6BAU callsign genealogy
Currently held by Bau, William D
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K6BAU's current licensee, walking backwards.
- Bau, William DNVgranted 2025-04-24cancelled 2025-05-23
Successor callsigns
Callsigns held now by people who previously held K6BAU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6BAU, oldest first.
- CASILLAS, WILLIAM A CA1987-09-08 → cancelled 1999-09-10
- Bau, William D CA2011-07-12 → cancelled 2023-07-13
- Bau, William D NV2025-05-23 active